Application And Research Of Shipborne Fire Noise Modeling In Underwater Acoustic Countermeasure

Ship-radiated noise provides information of search, detection and tracking for underwater acoustic detection equipments, and it’s one of the important information source of modern Marine information warfare. In addition, attack and track of acoustic-guided weapons and acoustic fuze weapons are based on the radiated noise, so the characteristics of ship-radiated noise is the important basis in underwater weapon development.At first, this paper discusses acoustic new confrontation technology and the development trend of the further research on the soft confrontation technology and also discuss the the significance of underwater bait simulation technology, and put forward my own views on construction of ship underwater acoustic countermeasure system to lay a certain foundation for the future research.In order to study the change rule of ship radiated noise characteristics, this article carries on the fundamental analysis for the acoustic characteristics of ship-radiated noise and preliminary research to the simulation of ship-radiated noise.Through a series of sine signals to structure line spectrum signal, with white gaussian noise by butterworth band-pass filter to structure the continuous spectrum signal, and make related simulation based on the MATLAB. Finally carries out wavelet de-noising and radiated analysis for the warship radiated noise power spectrum. The experimental results show that this paper provides target broadband noise waveform signal of abundant characteristics for building the signal level simulation system of passive sonar.At the same time, we discuss the influence by speed and heading of ship-radiated noisebased on the traditional model, the ship-radiated noise characteristics in source level change with the distance, speed characteristics can be reflected by doppler frequency shift, and azimuth change reflected in the radiation noise source level and different frequency noise of the delay.At last, we will able to put the dynamic parameters applied into the original model to obtain more meaningful optimization model of ship-radiated noise, and do the DEMON spectrum analysis and relevant research of ship-radiated noise at the sonar receiving end, so as to obtain the constant physical parameters, such as ship propeller blade number, plasma or shaft frequency. At the same time also provides a certain theoretical basis for the radiated noise cheating technology.